PARAMETER INDEPENDENT SCHEME FOR SINGULARLY PERTURBED PROBLEMS INCLUDING A BOUNDARY TURNING POINT OF MULTIPLICITY ≥ 1
Loading...
Date
2023-06
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
A numerical scheme is developed for parabolic singularly per turbed boundary value problems, including multiple boundary turning points
at the left endpoint of the spatial direction. The highest order derivative of
these problems is multiplied by a small parameter ε (0 < ε ≪ 1), and when
it is close to zero, the solution exhibits a parabolic type boundary layer near
the left lateral surface of the domain of consideration. Thus, large oscillations
appear when classical/standard numerical methods are used to solve the prob lem, and one cannot achieve the expected accuracy. Thus, the Crank-Nicolson
scheme on a uniform mesh in the temporal direction and an upwind scheme on
a Shishkin-type mesh in the spatial direction is constructed. The theoretical
analysis shows that the method converges irrespective of the size of ε with
accuracy O((∆t)
2 + N
−1
ln N). Three test examples are presented to verify
that the computational results agree with the theoretical ones.